High molecular weight polyquinazolones

ABSTRACT

HIGH MOLECULAR WEIGHT POLYQUINAZOLONES AND A PROCESS FOR THEIR PRODUCTION BY POLYCONDENSATION OF A MIXTURE OF POLYMERHOMOLOGOUS PRIMARY AROMATIC DIAMINES CONTAINING ETHER GROUPS WITH DIBENZOXAZINONES AT TEMPERATURES OF FROM 80 TO 250*C.

United States Patent P 17 70 707.2 Int. Cl. (108g 33/02 US. Cl. 260-49 2 Claims ABSTRACT OF DISCLOSURE High molecular weight polyquinazolones and a process for their production by polycondensation of a mixture of polymerhomologous primary aromatic diamines containing ether groups with dibenzoxazinones at temperatures of from 80 to 250 C.

The invention relates to high molecular weight, high melting polyquinazolones which are soluble in organic solvents, and to a process for their production.

It is known that polyquinazolones can be prepared by reacting dibenzoxazinones with low molecular weight aromatic diamines. The disadvantage of such materials is that they are sparingly soluble in organic solvents, so that they are extremely diflicult to work up into shaped products, foils, fibres and lacquers.

It is an object of this invention to provide high molecular weight polyquinazolones that are easily soluble in organic solvents. It is another object of this invention to provide a process for the production of these polyquinazolones. These objects are accomplished by a high molecular weight polyquinazolone comprising recurring structural units of the general formula wherein R represents an alkyl or aryl radical and R represents a single bond, a sulphonyl, carbonyl, oxygen, sulphur, alkylene, cycloalkyleue or aralkylene radical, or a radical of the formula wherein X represents oxygen, sulphur, sulphoxide, sulphonyl or carbonyl,

R represents a phenylene, naphthalene or diphenylene radical substituted or not,

Z represents a group of the general formula wherein Y represents a phenyleue, naphthalene or diphenylene radical, substituted or not, or a radical of the formula Y represents a sulphoxide, sulphonyl, carbonyl, oxygen, sulphur, lower alkylene, cycloalkyleue or aralkylene radical, and

n represents an integer of from 2-20,

wherein Y represents a phenylene, naphthalene or diphenylene radical, substituted or not, or a radical of the formula Y represents a sulphoxide, sulphonyl, carbonyl, oxygen, sulphur, lower alkylene, cycloalkylene or aralkylene radical and n represents an integer of from 2-20, with dibenzoxazinones of the general formula o g o gm-g: 1MB

wherein R represents an alkyl or aryl radical and R represents a single bond, a sulphonyl, carbonyl, oxygen, sulphur, alkylene, cycloalkylene or aralkylene radical, or the radical wherein X represents oxygen, sulphur, sulphoxide, sulphonyl or carbonyl,

said polycondensing being carried out in high boiling organic solvents at temperatures of 80 C. to 250 0., water being split off in the process.

The polycondensates according to the invention are readily soluble in organic solvents such as chloroform, carbon tetrachloride, dimethylformamide or N-methylpyrrolidone.

The polymer homologous mixtures of primary aromatic diamines used for the preparation of the polyquinazolones may be prepared, for example, by reacting aromatic polyethers which contain alkali metal phenolate end groups with aromatic halogenated hydrocarbons which have a nitro group in the ortho or para position, and hydrogenating the resulting dinitro compounds catalytically to the corresponding diamines. Thus, for example, an alkali metal salt of a bisphenol (4,4-dihydroxydiphenyl) is reacted with an aromatic bishalogen compound (4,4- di-chlorodiphenylsulphone) in a polar organic solvent (dimethylsulphoxide) at temperatures above 60 C. in a molar ratio which may range from slightly below 2:1 to slightly above 1:1; the polyether which carries alkali metal phenolate end groups is then further condensed with a halo-nitroaryl compound (4-nitrochlorobenzene); and the dinitro compound is hydrogenated in organic solvents with Raney nickel and hydrogen.

An aromatic polyether which carries halogen end groups, for example, may equally well be reacted with alkali metal salts of mononitrophenols to form the corresponding dinitro compounds which are then hydrogenated catalytically to the required diamines.

The amino end group content, i.e. the average molecular weight of the diamine, is determined by analytic method, e.g. titration with perchloric acid, so that it can be used in exact stoiohiornetric quantities for the condensation with dibenzoxazinones.

The following low molecular weight diamines maybe used in admixture with the high molecular weight diamines up to a molar ratio of 1:1:

4,4-diaminodiphenylether,

4,4'-diamino-diphenylmethane,

4,4'-diamino-diphenylpropane- 2,2)

1,3-diaminobenzene,

1,4-diaminobenzene,

4,4-diamino-diphenylsulphone,

benzidine, 4,4'-diamino-diphenylsulphide,

3 ,3'-diamino-diphenylsulphone,

bis- (4-aminophenyl) phosphine oxide,

m-xylylene-diarnine,

2,6-diaminopyridine,

1,5-diaminonaphthalene,

3 ,3 '-dimethyl-4,4'-diamino-diphenyl,

3 ,3 '-dimethoxyb enzidine,

1,5 -dip-aminophenoxy -naphthalene,

2,6-di-(p-aminophenoxy) -naphthalene,

4,4'-di-(p-aminophenoxy) -diphenyl,

4,4'-di- (p-aminophenoxy) -diphenylmethane,

4,4'-di- (p-aminophenoxy) -diphenylpropane- (2,2)

4,4-di- (p-aminophenoxy) -diphenylether,

1,4-di- (p-aminophenoxy -benzene,

4,4-di- (p-aminophenoxy) -diphenylsulphide,

4,4-di- (p-aminophenoxy) -diphenylsulphone,

4,4-di- (2"-chloro-4"-aminophenoxy) -diphenylpropane- (2,2) or Y Y 1,4 (2'-chloro-4'-aminophenoxy) -b enzene.

Suitable di-benzoxazinones are any compounds which can be prepared from bis-anthranilic acids and organic acid anhydrides by known methods.

Suitable solvents for carrying out the condensation are those which have a high boiling point and are capable of dissolving the polymer and if possible also the starting components. In some cases, the starting materials are only partly soluble but the polymer is readily soluble so that the initial dispersion becomes a highly viscous solution when the reaction is coming to an end. Chlorobenzene, dichlorobenzene,N,N-dimethylacetamide, N,N-dimethylformamide, N-methylpyrrolidone and N-dimethylsulphoxide are mentioned as illustrative but not limiting examples.

In some cases it is advantageous to add drying agents to the polycondensation reaction medium. Thus the water eliminated during the reaction is bound and can no longer react with nonreacted di-benzoxazinone. As drying agents can be used for example sodium sulfate, copper sulfate, calcium chloride and P 0 In a preferred embodiment of the process according to the invention, the polymer homologous diamine mixture and the di-benzoxazinone are dispersed in preferably equivalent quantities in a suitable solvent and condensed at temperatures in the range of C. to 250 C., preferably C. to 200 C., for reaction times of 1 to 30 hours while nitrogen is passed over. In principle, the reaction may also be carried out with one of the two components in excess. The solids content may lie between 5 and 40% and is preferably between 15 and 25%. After the polycondensation has come to an end, the polymer is precipitated by pouring the solution into an excess of water or organic precipitating agent, or the solutions may also be worked up directly into threads and foils without isolation of the polymer.

The new polyquinazolones are distinguished by exweight'of 4-nitrochlorobenzene are then added. Condensatremely good mechanical, thermal and electrical proption is then continued for another 5 hours under nitrogen erties, and, owing to their excellent solubility in many at 125 C. After removal of the main part of the dimethylorganic solvents, they can be worked up into threads, sulphoxide by vacuum distillation, the dinitro compound fibres and foils by known processes, but they may also 5 is precipitated with water and the excess 4-nitro-chlorobe formed from the melt into threads and fibres and into benzene is removed by steam distillation. After drying in moulded products by the injection moulding process. vacuo at 100 C., 915 parts by weight of the mixture The following examples are to further illustrate the inof ether sulphone oligomers which have nitro end groups vention without limiting it. 7 is isolated. The compound melts in the range of from The parts by weight are related to parts by volume 10, 228 to 244 C. as are kg. to litres. 805 parts by weight of the dinitro compound are dis- In the examples, the values for the relative viscosities solved in 3000 parts by volume of N-methylpyrrolidone were determined in chloroform at C., the concentraand hydrogenated in an autoclave for 3 hours at 120 C. tion being 0.2 g. of polymer in 100 ml. of solution. and a hydrogen pressure of 50 atmospheres, using 70 parts by weight of 'Raney nickel. After removal of the EXAMPLE I 15 reducing catalyst, the main part of the solvent is removed 116.4 parts by weight of the polymer homologous by vacuum distillation and the concentrated solution is ether di-amine mixture of the formula precipitated in 1000 parts by volume of water with vigor- (mol. wt.=1940) ous stirring, isolated by suction filtration and dried in vacuo at 100 C. 751 parts by weight of the polymer homologous diamine mixture are obtained in pure form. The material melts in the region of from 239 to 249 C. Amino end group analysis by titration with perchloric acid reveals an average molecular weight of 1940.

O HsC-\\ l-CH: EXAMPLE 2 116.4 parts by weight of the polymer homologous are heated at 180 C. in 400 parts by weight of N-methylether 41131111116 tu e O the formula pyrrolidone while nitrogen is passed over, and are stirred (for preparation see Example 1) (M.W.=1940) at this temperature for 15 hours. The highly viscous soluand 3408 parts by weight of the di benzoxazinone of the tion is then diluted with more solvent to a SOlIdS content 40 formula Q J Etc-47 N of about andthe p y isprecipitated y Pouring having a melting point of 203-205 c. are heated at it into vigorously stirred water. After suction filtration, 1 0 C. in 593 parts by weight of N-methylpyrrolidone thh precipitate is Washed twice With Water and dried, in while nitrogen is passed over, and the reaction mixture is a vacuo a 100 C. 12 -5 Parts by We g of the P Y- condensed for 24hours with stirring. The viscous solution qhhlalololle, Which has a melting range 015285" is diluted to a solids content of 15% with more solvent. C. and a relative viscosity 1 of 1.63 are isolated. The Th polymer i i l t d b precipitating th ol tion in Polyquhlazolone is readily Soluble in chloroform in the water, separated by suction filtration, washed with water cold. and methanol and dried in vacuo at 100 C. 139.2 parts Preparation of the aromatic ether diannine by weight of the Polyquinazoline which has a meltmg L 1940) range of 273 to 321 C. and a relativewiscosity =1.58

465 parts by weight of 4,4'-dihydroxydiphenyl are disare isolated. The polymer is soluble m chloroform. solved in 4000 parts by volume of dimethylsulphoxide under a nitrogen atmosphere. After the addition of 280.5 Preparatlon of the dl'benzoxazmone used m thls example parts by weight of solid 100% potassium hydroxide and 1 part by weight of 4,4-bis(4-amino-3-carboxyphedissolving at 100 'C., the water resulting from salt forma- 7 noxy)-diphenylsulfone are heated in 2 parts by weight tion is distilled off in vacuo at about 15 mm. Hg together of acetic acid anhydride for 2 hours at 110-120 C. After with about 10% dimethylsulphoxide. 574 parts by weight cooling to -80" C. to the reaction mixture are added of 4,4-dichlorodiphenylsulphone are then added. The re- 2.2 parts by weight of acetonitrile. The precipitate is acatnts are condensed for 8 hours while the reaction mixfiltered by suction after cooling to room temperature. ture is stirred and nitrogen is passed over. 236 parts by After repeating this procedure once more the precipitate thus obtained is washed with acetontrile and dried in to 188 C. are obtained. 805 parts by Weight of the vacuo at -100-- C. over KOH. Yield 0.87 part by weight dinitro compound are dissolved in- 4500 parts by volume (79%). M.P. 203-205 C. J of N-methylpyrrolidone and hydrogenated in an autoclave for 1.5 hours at 120 C. under a hydrogen pressure of EXAMPLE 3 40 excess atmospheres, using 80 parts by Weight of 150 parts by weight of the polymer homologous ether Raney nickel. After filtration of the reducing catalyst, the diarnine mixture of the formula main partof the solvent is removed by vacuum distilla- (M.W.=1500) tion and "the concentrated solution is precipitated with and 32.0 parts by weight of the di-benzoxazinone 0f the water with vigorous stirring, removed: by suction filtration formula and dried in vacuo at 100 C. 695 parts by weight o'fthe o polymer homologous diamine'mixture' are obtained. The

I! material melts in the region of 166-192" C. Amino end group analysis by titration with perchloric'acid indicates 0 0 an average molecular weight of 1500.

I l H o-c (3-0118 3 EXAMPLE 4 H N 97.0 parts by Weight of the'polymer homologous ether are heated to 150 C. in 1011 parts by weight of dimethyl diamine mixture of the formula acetamide while nitrogen is passed over, and the reactants 3 (M.W :'1940) (prepared according to Example 1), are condensed for 48 hours. The resulting polymer is isolated by precipitating the solution in water. 169.5 parts by weight of the polyquinazolone which has a melting formula 19.2 parts by weight of the di-benzoxazinone of the range of 264-298 C. and a relative viscosity 1 =1.32 and 5 parts by weight of P 0 are polycondensed by heatare obtained. The polymer is very readily soluble in mg to 190 C. in 425 parts by weight of N-methylpyrchloroform. rolidone for 24 hours while stirring and passing nitrogen Preparation of polymer homologous mixture of aroover the reaction medium; Thereafter the solution is diluted matie ether diamines of the formula with more solvent to a concentration of 15% by Weight.

(M W,=1500) The polymer is precipitated by pouring the solution into 372 parts by Weight of 4,4-dihydroxydiphenyl are diswater, suction filtered, Washed with water and methanol solved in 8000 parts by volume of dimethylsulphoxide and dried at 100 C. in vacuo. 101.5 parts by weight of under nitrogen. After the addition of 161.7 parts by the polyquinazolone are isolated, having a melting range weight of sodium hydroxide (99%) dissolved in 170 of 274-325 C. and a relative solution viscosity 7 of parts by volume of water, the water resulting from salt 1.71. v v formationtogether with the added water and 1500 parts The polymer is soluble in chloroform. by volume of dimethylsulphoxide are distilled 01? in What we claim is: vacuo at 70 to 80 C./ 15 mm. Hg 430.5 parts by'weight 1. The high molecular Weight polyquinazolone conof 4,4'-dichloro-diphenylsulphone are-then added. The resisting essentially of recurring structural units of the genactants are condensed for 8 hours with stirring while l f l nitrogen is passed over. 236 parts by weight of- 4 nitrochlorobenzene are then added and condensation is con- I tinued for another 5 hours at 125 C. After removal of g the main part of the dimethyl-sulphoxide in vacuo the re- -N R1 N-Q action mixture is precipitated with water, and, excess 4- (FRI nitrochlorobenzene is removed by steam distillation.

After drying in vacuumat 100 C., 805 parts by weight I of the polymer homologous ether sulphone which has whereinQ is a member. selected from the group connitro end groups and which has a softening range of 159 sisting of (l) mole percent of the member 9 .10 R --ZR and (2) at least 50 mole percent of R represents methyl; said members R ZR wherein the remainder R represents a single bond or is selected from the group consisting of the bivalent radicals phenylene 5 0s Oz-O diphenylene diphenylene ether diphenylene methane R represents phenylene; diphenylene propane Z represents di h l lf n and t represents an integer of from 2-20, said polydi h l lfid quinazolones having a relative solution viscosity as di h k h hi id 15 measured on a solution of 0.2 of the polymer in 100 ml. chloroform at 25 C. of above 1.1 and a softenxylylene pyridinylene mg range of from 250 C. to 350 C. h h l 2. Polymers of claim 1 wherein Q is 100% of the dimethyl diphenylene member 2- 2- dimethoxy diphenylene 20 diphenyloxy napthalene References cued p y y p y UNITED STATES PATENTS diPhenYloXY diphenylmethane 3 408 326 10/1968 Errede 26047 diphenyloxy diphenylpropane 2 diphenyloxy dichlorodiphenylpropane 5 WILLIAM H. SHORT, Primary Examiner diphenyloxy diphenylether diphenyloxybenzene L. L. LEE, Assistant Examiner diphenyloxy dichlorobenzene diphenyloxy diphenyl sulfide and 30 diphenyloxy diphenyl sulfone 26030.2, 30.8, 32.6, 33.8, 47, 65, 78 

